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MINN1001

Underground Coal Mining Methods: Pillar Extraction

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Continuous Miner Pillar Extraction

Medium depth reserve

Higher production rate

Medium capital requirement

Higher reserve utilisation 70%

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Pillar Extraction

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GOAF

GOAF

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Minedout

Mined out

Fender

Snook

Pillar

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Snook

Policemen Sticks

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Pillar Extraction

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Pillar Extraction

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Pillar Extraction

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Pillar Extraction

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Pillar Extraction

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Pillar Extraction

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Pillar Extraction

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Pillar Extraction

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Pillar Extraction

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Pillar Extraction

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Pillar Extraction

Goaf

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Pillar Extraction

Ventilation: Splitting Through Goaf

Bleed Methane Out of Goaf

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Pillar Extraction

Ventilation: Coursing Past Face

Let Methane Build Up > 15% in Goaf

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Small Goaf

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Big Goaf

Breaker Line

Sticks

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Golden Rules for Pillar Extraction

1. Always mine toward the nearest solid

2. Never leave a half finished pillar

3. Leave a bigger snook on the intersection4. Avoid as far as possible stooping between goafs

5. Never change direction or sequence

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CM Partial Pillar Extracation

Medium depth reserve

Higher production rate

Medium capital requirement

Higher reserve utilisation 70%

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Partial Pillar Extraction

Checker Board Stooping

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Partial Pillar Extraction

Checker Board Stooping

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Partial Pillar Extraction

Checker Board Stooping

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Partial Pillar Extraction

Checker Board Stooping

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Partial Pillar Extraction

Checker Board Stooping

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Partial Pillar Extraction

Checker Board Stooping

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Partial Pillar Extraction

Checker Board Stooping

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Partial Pillar Extraction

Checker Board Stooping

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Partial Pillar Extraction

Checker Board Stooping

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Advantages of Checker Board Stooping

1. Utilisation +/- the same as stooping

2. No or little subsidence

3. Less disruption to ground water

4. No sudden goaf collapse

5. Easier to ventilate

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Partial Pillar Extraction

Pillar Splitting

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Advantages of Pillar Splitting

1. Utilisation +/- the same as stooping

2. No or little subsidence if fenders do not fail

3. Less disruption to ground water

4. No sudden goaf collapse

5. Easier to ventilate

6. Very high rate of production

But be warned: Pillar fenders may fail violently!!!!!!!!!!!